From owner-freebsd-hackers Thu Jun 17 13:53: 5 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id ADC0E155A4 for ; Thu, 17 Jun 1999 13:52:55 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id GAA06277; Fri, 18 Jun 1999 06:22:55 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id GAA54107; Fri, 18 Jun 1999 06:23:04 +0930 (CST) Date: Fri, 18 Jun 1999 06:23:03 +0930 From: Greg Lehey To: Ville-Pertti Keinonen Cc: hackers@freebsd.org Subject: Re: vinum performance Message-ID: <19990618062303.T9893@freebie.lemis.com> References: <199906170743.DAA16929@cs.rpi.edu> <19990617183225.Q9893@freebie.lemis.com> <86r9nbq9dp.fsf@not.demophon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <86r9nbq9dp.fsf@not.demophon.com>; from Ville-Pertti Keinonen on Thu, Jun 17, 1999 at 03:50:10PM +0300 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thursday, 17 June 1999 at 15:50:10 +0300, Ville-Pertti Keinonen wrote: > > grog@lemis.com (Greg Lehey) writes: > >>> You've accidentally striped subdisks on the same drive? ;--) >>> >>> Like Greg Lehey said, you haven't really provided enough details. >> >> He did provide one detail, though; this is a concatenated plex, not a >> striped one. > > Or he at least *thinks* it's concatenated. ;--) I didn't miss that - > but given numbers that bad, it sounds like there might be some really > silly mistake involved. OK, you're the second person to say that. Let's wait until he comes back with more details. >>> Many disks are shipped with write caching disabled, and write >>> performance can be significantly worse than read performance. >> >> Not if it works without Vinum. > > My thought was that he might be comparing read performance and write > performance (they are often pretty close). But even so, the > difference shouldn't be *that* big. I'm sure there's something wrong here. I'd just like to find out what it is. I don't think it's with Vinum, but I'm prepared to be proven wrong. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message